[EV-5614] Add CLUSTER_CONN_TYPE to Policy Recommendation deployment

[dimitri-nicolo]

Description

• Adds the CLUSTER_CONN_TYPE to Policy Recommendation deployment.
  • The type is either "standalone" or "management"
  • The configuration variable is used in Policy Recommendation to determine if the managed cluster watcher should be started.

See: EV-5614: https://github.com/tigera/calico-private/pull/8668

For PR author

• Tests for change.
• If changing pkg/apis/, run make gen-files
• If changing versions, run make gen-versions

For PR reviewers

A note for code reviewers - all pull requests must have the following:

• Milestone set according to targeted release.
• Appropriate labels:
  • kind/bug if this is a bugfix.
  • kind/enhancement if this is a a new feature.
  • enterprise if this PR applies to Calico Enterprise only.